Enamel and diamond necklace, David Webb, circa 1960 of bombe form, designed as a series of elongated crescent-shaped plaques decorated top and bottom with black enamel, alternating between square openwork links, the front pave-set with round brilliant-cut diamonds together weighing approximately 6.40 carats, mounted in platinum and 18ct gold, internal circumference approximately 380 mm, signed Webb.